Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities (Narrative) (Details)

v3.20.4
Derivative Instruments and Hedging Activities (Narrative) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
$ / bbl
$ / MMBTU
Sep. 30, 2020
USD ($)
Jan. 31, 2020
USD ($)
Warrant liability      
Derivative [Line Items]      
September 2020 Warrants | $ $ 79.4 $ 23.9  
Acquired Contingent Consideration      
Derivative [Line Items]      
Contingent payment received | $     $ 10.0
Acquired Contingent Consideration | Minimum      
Derivative [Line Items]      
Threshold | $ / bbl 53.00    
Weighted average price (in dollars per share) | $ / MMBTU 3.18    
Acquired Contingent Consideration | Maximum      
Derivative [Line Items]      
Threshold | $ / bbl 60.00    
Weighted average price (in dollars per share) | $ / MMBTU 3.30